JPH0533997Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a newly developed radioactive waste storage container for storing waste cans filled with radioactive waste, etc.

"Prior Art and Its Problems" In general, low-level radioactive waste generated in nuclear power plants and the like can be easily handled by, for example, being packed in drums (waste cans). The waste contained in the waste can is stored in a storage facility provided within the plant.

However, the above-mentioned processing method has the following problems that need to be solved.

In other words, with the increase in low-level radioactive waste generated within plants, it is becoming difficult to secure storage facilities within the plants.

Therefore, the construction of a dedicated stocking area has been proposed, and the idea is to transport the waste cans to the stocking area, but some of these waste cans are thought to be corroded, so If the waste cans are removed from the plant, there is a risk that the environment including the transport route of the waste cans and the storage location at the destination of the waste cans will be contaminated. Therefore, it is desired to develop a container for transportation that can contain these waste cans and store them in a storage area as is. In addition, storage containers used for such purposes must not only not leak radiation, but also have impact resistance in case of accidents during transportation, as well as storage space. Durability and water permeability are required to prevent radioactivity from escaping.

Conventionally, as a storage container for storing the waste can,
A concrete container with an open top is provided, waste cans containing low-level radioactive waste are stored in the container, and after filling the gaps between these waste cans with mortar, etc., a concrete lid is attached. Place it,
A storage method has been proposed in which the concrete container and the concrete lid are joined together using an adhesive or the like.

However, such concrete structures have poor impact resistance, are difficult to reduce in weight, and special concrete with high waterproof performance must be used to prevent leakage of radioactivity due to corrosion of waste cans. However, there was a problem with the high cost.

This invention was proposed in view of the above circumstances, and its purpose is to be able to safely store and transport waste cans, reduce costs with a simple structure, and provide impact resistance, durability, and An object of the present invention is to provide a radioactive waste storage container with improved waterproof properties.

``Means for Solving Problems'' Therefore, in the present invention, in a container for storing waste cans filled with radioactive waste, etc., a bottomed cylindrical steel container body with an open top, and a bottomed cylindrical steel container body with an open top, The container includes a steel lid that closes the upper opening, and a concrete layer that is formed along the outer periphery of the container body and the lid and constitutes the outer wall of the storage container. Reinforcing steel materials extending in the longitudinal direction or the width direction and arranged in parallel at intervals in the other direction are integrally provided, and the reinforcing steel materials are bent into a chevron shape along the longitudinal direction, and the convexity on the mountain side is formed. It is characterized by connecting reinforcing steel bars arranged in a lattice pattern.

``Function'' In the storage container of the present invention, reinforcing steel members bent into a chevron shape are arranged side by side on the outer peripheral surfaces of the container body and lid, so the concrete is densely packed as a whole, making it difficult to form voids. The integration of the main body and lid with the concrete is strengthened, and it works to disperse cracks rather than expand them, improving the impact resistance and durability of the storage container and reducing its weight. I can figure it out.

``Example'' Below, an example of the present invention is shown in Figures 1 to 12.
To explain with reference to the figures, in these figures,
Reference numeral 1 indicates a waste can, and reference numeral 2 indicates a storage container according to the present invention for storing the waste can 1.

The storage container 2 includes a bottomed cylindrical steel container main body 3 with an open top, a steel lid 4 that closes the upper opening of the container main body 3, and the container main body 3 and the lid 4. It mainly consists of a concrete layer 5 formed along the outer periphery and constituting the outer wall of the storage container.In order to increase impact resistance and integrate with the concrete layer 5, each of the container body 3 and lid body 4 is Improvements have been made to the outer surface. That is,
Reinforcing steel members 6 extending in the longitudinal direction and arranged in parallel at intervals along the width direction are integrally provided on the outer peripheral surfaces of the container body 3 and the lid body 4, and are assembled into the reinforcing steel members 6 in a lattice shape. The reinforced reinforcing bars 7 are integrally connected.

The reinforcing steel material 6 is bent into a mountain shape in which peaks and valleys alternately continue in an uneven manner along its longitudinal direction, and the valleys (protrusions on the valley side) are connected to the container body 3 and the lid. It is brought into contact with the body 4 and fixed integrally, for example, by a method such as welding, and a part of the reinforcing steel 7 is arranged along the mountain part (the convex part on the mountain side) of the reinforcing steel material 6. It is designed to be connected to this peak by a method such as welding.

Next, the storage container 2 will be described in detail. First, the container body 3 has a cylindrical shape with an open top and a bottom, and can accommodate a plurality of waste cans 1 (four in the illustrated example). The inner diameter and depth are set larger than the height of the waste can 1 and the outer diameter of the periphery of the four waste cans 1. As shown in FIG.
is formed, and a lid 4 covering the upper opening of the container body 3 is placed thereon. Further, the reinforcing steel members 6 provided on the outer circumferential surface of the front, rear, left and right peripheral walls 3a of the container body 3 extend in the vertical direction of the container body 3 and are arranged in parallel at intervals in the width direction, and The reinforcing steel material 6 of the portion 3b is integrally provided in a lattice shape extending from front to back, left to right, and left to right.

In addition, the reinforcing reinforcing bars 7 that extend in the vertical direction within the reinforcing reinforcing bars 7 disposed on the peripheral wall 3a of the container body 3 protrude upwardly from the upper end of the container main body 3, and can be bent in the middle to form the lid. It is designed so that it can be wrapped with the reinforcing steel bar 7 of No. 3.

Next, as shown in FIG. 3, the lid 4 that closes the upper opening of the container body 3 is placed with its peripheral edge on the flange 10 of the container body 3, and these peripheral edges and the flange 10 are connected. By welding, it is firmly fixed to the container body 3. The reinforcing steel material 6 provided on the outer circumferential surface of the lid body 4 is integrally provided in a lattice shape from front to back and left and right, similar to the reinforcing steel material 6 on the bottom plate portion 3b of the container body 3. As shown in FIGS. 5 to 7, the reinforcing bars 7 are connected by welding or the like while being placed along the reinforcing steel material 6 on the convex portion on the mountain side thereof.

Further, the upper end of the concrete layer 5 formed along the peripheral wall 3a of the container body 3 protrudes upwardly than the upper end of the container main body 3, and the concrete layer 5 to be poured on the lid 4 is placed inside the upper end of the concrete layer 5. It is designed to form a pouring space. Further, as shown in FIG. 5, hanging fittings 11 are buried in the four corners of the upper surface of the concrete layer 5, so that the storage container 1 can be hung by a crane or the like. In FIG. 3, reference numeral 12 denotes a gap formed in the upper end surface of the concrete layer 5, which is provided for the purpose of avoiding thermal effects on the concrete during welding of the lid.

Hereinafter, the operation etc. of the storage container 2 configured in this way will be explained.

As shown in FIG. 1 etc., in order to form this storage container 2, reinforcing steel members 6 bent into a chevron shape are arranged in parallel on the outer peripheral surfaces of the peripheral wall portion 3a and the bottom plate portion 3b of the container body 3. Reinforcement reinforcing bars 7 are welded to the peaks of the reinforcing steel material 6, and concrete is poured along the outer periphery of the container body 3.

Container body 3 with chevron-shaped reinforcing steel material 6 attached
Since the reinforcing steel material 6 has a truss structure that functions as a lattice material of the truss, its rigidity is improved and it is also strong in tension, and the overall strength is improved. In addition, since the reinforcing steel material 6 also functions as a spacer for the reinforcing reinforcing bars 7, the reinforcing reinforcing bars 7
The assembly becomes easy and the assembly work efficiency can be improved.

In addition, since the concrete poured around the outer periphery of the container body 3 flows through the opening created between the reinforcing steel material 6 and the container body 3 and becomes integrated, voids are less likely to be formed in the concrete and peeling of the concrete is prevented. Ru. Furthermore, since the reinforcing steel material 6 works to disperse cracks in the concrete rather than expanding them, it is possible to further strengthen the integration effect between the concrete and the container body 3, and it is possible to reduce the weight. This will improve its durability, impact resistance, etc.

When using the storage container configured in this way (when processing the waste can 1), first, the upper part is opened as shown in FIG. After storing the waste cans 1 in the container in which the waste cans 5 are formed and filling the gaps between these waste cans 1 with mortar or the like, the upper opening is covered with the lid 4 and the peripheral edge is attached to the flange part 10. Overlap and weld along the periphery.

Next, the reinforcing reinforcing bars 7 protruding from the upper end of the concrete layer 5 are bent onto the lid 4 and attached to the reinforcing reinforcing bars 7 of the lid 4, and concrete is poured onto the lid 4 so that the upper part is covered with concrete. Form layer 5.

Then, as shown in FIG. 12, a binding cable 14 is attached to the hanging fitting 12 via a shackle 13, and this is suspended by a crane or the like.
They are loaded onto a trailer, etc., and transported by trailer to a designated stocking location (trench).
Store.

As described above, the waste can 1 is sealed inside the storage container 2, which has a composite structure made of steel plates and concrete, and is protected by the storage container 2, which has excellent impact resistance and waterproof properties. , waste can 1
can improve safety when transporting
Furthermore, during storage, there is no risk that the storage area will be contaminated by radioactivity leakage. Furthermore, since the hanging fittings 11 allow movement by a crane or the like, there is no disadvantage in terms of handling, and the transportation work can be reduced and the transportation processing work can be speeded up.

"Effects of the Invention" As explained above, the present invention provides the following excellent effects.

It has a double structure of a steel container and a concrete layer covering its outer periphery, so unlike a simple concrete structure, it has excellent impact resistance and durability, and even if the outer concrete is subjected to impact etc. The internal container reliably maintains airtightness, thereby reliably preventing radioactive contamination of the route for transporting the waste can, thereby improving safety during transport.

A reinforcing steel material bent into a chevron shape is arranged side by side on the outer peripheral surface of a steel container body and a steel lid body that closes the upper opening of the container body, and reinforcing steel bars are welded to the peaks of the reinforcing steel material, Because concrete was placed along the outer surfaces of the container body and lid, the concrete is densely packed as a whole, making it difficult to form voids, and strengthening the integration of the container body and lid with the concrete.
Furthermore, it works to disperse cracks rather than to enlarge them, thereby improving the impact resistance and durability of the storage container and reducing its weight.

In addition, since the waste can has a sealed structure inside the steel container body, its waterproofness can be improved without using special highly waterproof concrete for the outer wall of the storage container. , it is possible to reduce costs.
Furthermore, since no organic substance such as adhesive is used to seal the lid, there is no risk of deterioration of the organic substance, and the applicability to long-term storage of radioactive waste cans can be improved.

The double structure of the steel container and the concrete layer allows the storage container to satisfy not only durability and impact resistance, but also water permeability, making it suitable as a storage container for waste cans filled with radioactive waste. It is possible to provide a container that is not only impact resistant in case of accidents during transportation, but also reliably prevents radioactivity from escaping at the storage location, and satisfies the requirements for durability and water permeability. can do. As a result, it is possible to eliminate the risk of contamination of the stock area etc. due to radioactive leakage during storage, and it is possible to demonstrate excellent practicality as a storage container for waste containers, especially those that corrode. .

[Brief explanation of the drawing]

1 to 12 show an embodiment of the present invention, in which FIGS. 1 and 2 are sectional views, respectively, FIG. 3 is an enlarged sectional view of the chain line circle in FIG. 2, and FIG. is a cross-sectional view along the line of Fig. 2, No. 5
The figure is a plan view showing the state in which the lid is attached, FIGS. 6 and 7 are front views for explaining the installation procedure of reinforcing steel materials, respectively, FIG. 8 is a plan view of the steel container body, and FIG. Figure 10 is a half sectional view of the container, Figure 10 is a half sectional view seen from the bottom plate side, Figure 11 is a perspective view of the container before it is stored, and Figure 12 is a It is a perspective view showing a hanging state. 1... Waste can, 2... Storage container, 3... Container body, 4... Lid, 5... Concrete layer, 6...
...Reinforcement steel material, 7...Reinforcement reinforcing bar, 10...Flange portion, 11...Hanging fitting.

Claims (1)

[Scope of utility model registration request] A container for storing waste cans filled with radioactive waste, etc., includes a bottomed cylindrical steel container body with an open top, a steel lid body that closes the upper opening of the container body, and these container bodies and a concrete layer formed along the outer periphery of the lid and constituting the outer wall of the storage container; Reinforcing steel materials are integrally provided in parallel in parallel, and the reinforcing steel materials are bent into a mountain shape along the longitudinal direction, and reinforcing reinforcing bars arranged in a lattice shape are connected to the protrusions on the mountain sides. A radioactive waste storage container characterized by: